* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #f0f0f0;
  --text: #0f0f0f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --text: #f0f0f0;
  }
}

body {
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100dvh;
}

main {
  min-height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;
}

h1 {
  user-select: none;
}